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Arada [10]
3 years ago
9

Simplify 7 + (-3) A). -10 B). -4 C). 4 D). 10

Mathematics
1 answer:
nordsb [41]3 years ago
7 0

Answer:C

Step-by-step explanation:

7+(-3)

+X-= -

7-3= 4

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A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past
Minchanka [31]
<h2><u>Answer with explanation</u>:</h2>

Let \mu be the distance traveled by deluxe tire .

As per given , we have

Null hypothesis : H_0 : \mu \geq50000

Alternative hypothesis : H_a : \mu

Since H_a is left-tailed and population standard deviation is known, thus we should perform left-tailed z-test.

Test statistic : z=\dfrac{\overlien{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

where, n= sample size

\overline{x}= sample mean

\mu= Population mean

s=sample standard deviation

For n= 31,\ \sigma=8000,\ \overline{x}=46,800\ \&\ s=46,800, we have

z=\dfrac{46800-50000}{\dfrac{8000}{\sqrt{31}}}=-2.23

By using z-value table,

P-value for left tailed test : P(z≤-2.23)=1-P(z<2.23)   [∵P(Z≤-z)=1-P(Z≤z)]

=1-0.9871=0.0129

 Decision : Since p value (0.0129) < significance level  (0.05), so we reject the null hypothesis .

[We reject the null hypothesis when p-value is less than the significance level .]

Conclusion : We do not have enough evidence at 0.05 significance level to support the claim that t its deluxe tire averages at least 50,000 miles before it needs to be replaced.

4 0
3 years ago
What transformations take place by graphing the function below in respect to its parent function? Check all that apply.
mihalych1998 [28]

Answer:

- Vertical Stretch

-Left 7 Units

-Up 2 units

Step-by-step explanation:

Because the formula is being multiplied by a number larger than 1, it is being vertically stretched. In this problem, it is being vertically stretched by a factor of 3/2.

When X is being added to in the parenthesis, it causes the graph to shift to the left. Since the equation has (X+7), the graph shifts left by 7 units.

When a number is added to the equation, it causes the graph to shift upwards. In this example, 2 is being added, therefore, the graph shifts upwards by 2 units.

That means there is a vertical stretch by a factor of 3/2, a horizontal translation left 7 units, and a vertical translation up 2 units

6 0
3 years ago
Koshanah rode her bike for 35 minutes on monday, wendsday, and saterday and 55 minutes each on tusday and thersday . Write an ex
dem82 [27]

Answer:

215 minutes

Step-by-step explanation:

Let

Number of days she rode for 35 minutes = x

Number of days she rode for 55 minutes = y

Total time spent riding her bike = 35x + 55y

x = Monday + Wednesday + Saturday

x = 3 days

y = Tuesday + Thursday

= 2 days

Substitute into the equation

Total time spent riding her bike = 35x + 55y

= 35(3) + 55(2)

= 105 + 110

= 215 minutes

8 0
3 years ago
What is the name of the segment inside the large triangle?
NNADVOKAT [17]
The segment inside the large triangle is B: Altitude.
6 0
4 years ago
Read 2 more answers
Can someone help me with this math problem? and show me the work? please haha
Licemer1 [7]
I don’t know if you’ll understand the steps

8 0
3 years ago
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